EP0606381A1 - Load cell mount for hospital weigh bed - Google Patents
Load cell mount for hospital weigh bedInfo
- Publication number
- EP0606381A1 EP0606381A1 EP92921656A EP92921656A EP0606381A1 EP 0606381 A1 EP0606381 A1 EP 0606381A1 EP 92921656 A EP92921656 A EP 92921656A EP 92921656 A EP92921656 A EP 92921656A EP 0606381 A1 EP0606381 A1 EP 0606381A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bed
- ball
- cup
- base
- load cell
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
- G01G3/14—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing measuring variations of electrical resistance
- G01G3/1402—Special supports with preselected places to mount the resistance strain gauges; Mounting of supports
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
- A61G7/05—Parts, details or accessories of beds
- A61G7/0527—Weighing devices
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
- A61G7/05—Parts, details or accessories of beds
- A61G7/057—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor
- A61G7/05738—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor with fluid-like particles, e.g. sand, mud, seeds, gel, beads
- A61G7/05746—Arrangements for preventing bed-sores or for supporting patients with burns, e.g. mattresses specially adapted therefor with fluid-like particles, e.g. sand, mud, seeds, gel, beads fluidised by air flow
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/44—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
- G01G19/445—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons in a horizontal position
Definitions
- This invention relates to a weigh bed and is particularly related to a fluidized patient support system weighing of the order of 1,500 pounds.
- the fluidized patient support system is disclosed in U.S. Patent No. 4,672,699 whose disclosure is incorporated herein to form a part of this disclosure.
- the patient support system includes a tub filled with a mass of granular material and covered with a loose-fitting flexible patient contact sheet. Air is forced into the granular material to fluidize it, thus supporting the patient on a fluidized system.
- the tub, the granular materials and patient weigh in excess of 1,000 pounds, usually in the range of 1200 - 1600 pounds.
- the tub is mounted on a base which is trape ⁇ zoidal in cross section.
- An objective of the present invention has been to provide a scale for continuously weighing the patient, the scale including a transducer formed by load cell beams generally of the type disclosed in U.S. patent No. 4,974,692 whose disclosure is incor ⁇ porated herein.
- a patient support structure is mounted on a base by means of four load cells, one mounted at each corner of the bed.
- Each load cell has a load cell beam that is cantilever- mounted at one end and engages a steel ball at the other end.
- the steel ball is engaged by upper and lower flat seats that provide a rolling contact between the ball and the seats.
- the ball and flat seat combination provides assurance that only vertical components of force are imposed on the load cell and hence measured by the scale.
- a system of rods con ⁇ nected between the base of the bed and the patient support prevents the patient support structure from rolling off the balls.
- a further objective of the present invention has been to provide an improvement on the rolling ball support of the '692 patent.
- the objectives of the present invention are attained by substituting for the flat seats of the '692 patent cup-shaped upper and lower surfaces.
- the cup-shaped upper and lower surfaces are generally hemispherical and of a substantially greater diameter than the ball captured between the surfaces. Any tendency of the patient support to move in a lateral direction is therefore resisted by the ball having to roll uphill, so to speak, with respect to the cup- shaped seats which confine it.
- the heavier the load, that is the patient support the harder it is to ride uphill to dislodge the cups from the steel ball disposed between them.
- Another feature of the invention has been to provide retainers cooperating with bolts depending from the patient support tub, the retainers providing further assurance that lateral movement of the tub with respect to the base will be resisted.
- the bolts themselves pass through holes in the base to provide added insurance against lateral movement.
- the bolts are maintained out of contact with the retainers or the base itself in normal operation so that there is no frictional force between tub and base that would influence the weighing of the patient.
- the base has two trapezoidal structures each having a top horizontal bar.
- Each horizontal bar has a trough formed in its upper surface within which each load cell beam is disposed, there being four load cell beams, one at each corner of the bed.
- Fig. 1 is a perspective view of the inven ⁇ tion
- Fig. 2 is a diagrammatic, disassembled perspective view of the invention
- Fig. 3 is a disassembled cross-sectional view through one end of the bed
- Fig. 4 is an enlarged cross-sectional view showing the load cell mount.
- a fluidized patient support system is shown.
- a deep tub 10 is mounted on base 11, the base being trapezoidal in cross-section.
- the tub 10 is filled with a ceramic granular material which is covered by a flexible sheet 12.
- a blower system (not shown) drives air through the granular material in the tub creating a fluidized bed which supports the patient while resting on the sheet 12.
- the blower is connected to the bed by a hose of sufficient flexibility that it does not add a force component to the weighing system.
- the bed is particu ⁇ larly useful for patients who have been immobilized for long periods of time and have developed bed sores. As shown in Fig.
- the base 11 has as principal structural elements two horizontally-spaced trapezoidal structures 15.
- Each trapezoidal structure includes a top bar 16.
- the upper surface of the top bar 16 is formed as a trough 17 within which four load cells 20 are mounted, one load cell being at each corner of the bed.
- a wrapper 21 is wrapped around the sides and bottom of the base 11 to enclose the base.
- a stiffener plate 22 extends between the two trape- zoidal structures 15 and is bolted at its ends to the trapezoidal structures while leaving the troughs 17 exposed.
- each trough has a bottom wall 23.
- a spacer 25 is welded to the bottom wall 23.
- Each load cell 20 has a beam 26 secured by two anchor bolts 27 passing through the bottom wall 23 and spacer 25.
- Each load cell has a bridge connection of four strain gauges, not shown, forming a transducer connected by conductors 28 (Fig. 2) which are in turn connected to a load cell summing junction box 29 and from there to a digital display 30.
- the anchor bolts 27 secure one end of the load cell beam 26 in the trough leaving a cantilevered free end 32 free to flex vertically.
- a lower ball cup stud 35 is threaded into the free end 32 of the load cell 20.
- a similar ball cup stud 36 is secured by a nut 37 to the bottom of the tub and precisely overlies the ball cup stud 35.
- the ball cup studs have facing surfaces 38 in the lower stud and 39 in the upper stud which are generally hemispherical.
- a 5/8 inch harden ⁇ ed stainless steel ball 40 is mounted between the surfaces 38, 39 to provide the sole connection of the tub to the load cell and base. Collectively, the four load cells provide the entire support of the tub through the hardened balls 40.
- the diameter of the sphere that defines the surfaces 38, 39 is approxi ⁇ mately 7/8 inch. The surfaces are hardened to about a Rockwell 62.
- a clearance hole 45 is formed in the top bar 16 of the trapezoidal structure 15.
- a stop bolt 46 passes through a clamp plate 43, the bottom wall 47 of the tub 10 and a tub plate 44.
- a cylindrical spacer 48 is mounted on the bolt 46 below the tub and is secured thereto by a nut 49 and washers 50 and 51.
- the nut 49 passes through the clearance hole 45 in the top bar 16.
- the clearance hole 45 is of a diameter substantially greater than the transverse dimension of the nut 49 so that there is no contact between the nut or any part of the bolt 46 and the elements attached to it and the base 11.
- a retainer clip 55 is attached by a bolt 56 to the side of the trapezoidal structure 15 at each corner of the base.
- the retainer clip has a hori ⁇ zontal section 57 that terminates in an edge 58 having a semicircular recess 59 of greater diameter than the spacer 48.
- the spacer 48 is received in the recess 59, but the dimension of the recess is greater than the diameter of the spacer so that normally there is no contact between the retainer clip and the spacer.
- the retainer clip cooperating with the bolt as well as the clearance hole 45 cooperating with the nut 49 provide assurance that there will be no lateral movement of the tub great enough to cause the ball cup studs to become dislodged from the balls.
- the tub is supported only by the engagement of the studs 35, 36 with the ball 40 at each corner of the tub.
- the weight of the tub and patient stresses the load cell beams causing their transducers to provide signals proportional to the weight that is stressing them.
- the weight of the patient is displayed on the digital display 30.
- Each ball 40 provides single point contact with its upper and lower cup stud 36, 35 so that only vertical components of force are applied to the load cell beam. Any tendency of the tub to move laterally with respect to the base is resisted by the cup stud and ball interconnection.
- the upper stud must roll uphill over the ball to be dislodged and/or the ball must roll uphill over the lower stud to be dislodged.
Landscapes
- Health & Medical Sciences (AREA)
- Veterinary Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Nursing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Invalid Beds And Related Equipment (AREA)
- Prostheses (AREA)
- External Artificial Organs (AREA)
- Rehabilitation Tools (AREA)
- Medical Preparation Storing Or Oral Administration Devices (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/770,908 US5173977A (en) | 1991-10-04 | 1991-10-04 | Load cell mount for hospital weigh bed |
US770908 | 1991-10-04 | ||
PCT/US1992/008329 WO1993006807A1 (en) | 1991-10-04 | 1992-09-30 | Load cell mount for hospital weigh bed |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0606381A1 true EP0606381A1 (en) | 1994-07-20 |
EP0606381A4 EP0606381A4 (en) | 1994-08-24 |
EP0606381B1 EP0606381B1 (en) | 1997-11-19 |
Family
ID=25090082
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92921656A Expired - Lifetime EP0606381B1 (en) | 1991-10-04 | 1992-09-30 | Load cell mount for hospital weigh bed |
Country Status (7)
Country | Link |
---|---|
US (1) | US5173977A (en) |
EP (1) | EP0606381B1 (en) |
AT (1) | ATE160283T1 (en) |
AU (1) | AU2787592A (en) |
CA (1) | CA2119456C (en) |
DE (1) | DE69223255T2 (en) |
WO (1) | WO1993006807A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8717181B2 (en) | 2010-07-29 | 2014-05-06 | Hill-Rom Services, Inc. | Bed exit alert silence with automatic re-enable |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5802640A (en) | 1992-04-03 | 1998-09-08 | Hill-Rom, Inc. | Patient care system |
US5831221A (en) * | 1994-10-13 | 1998-11-03 | Future Sysems, Inc. | Caster mounted weighing system |
US5823278A (en) * | 1994-10-13 | 1998-10-20 | Future Systems, Inc. | Caster mounted weighing system |
US5570483A (en) * | 1995-05-12 | 1996-11-05 | Williamson; Theodore A. | Medical patient transport and care apparatus |
US5859390A (en) * | 1996-10-23 | 1999-01-12 | Hill-Rom, Inc. | Hospital bed scale mounting apparatus |
US5990423A (en) * | 1998-05-28 | 1999-11-23 | Eze Weigh, Llc | Mobile hospital bed scale |
US7232962B2 (en) * | 1998-05-28 | 2007-06-19 | Richard Rynd | Mobile hospital bed scale |
US6680442B1 (en) | 1998-05-28 | 2004-01-20 | Eze Weigh, Llc | Mobile hospital bed scale |
US6924441B1 (en) | 1999-09-29 | 2005-08-02 | Hill-Rom Services, Inc. | Load cell apparatus |
US6639157B2 (en) | 2000-08-22 | 2003-10-28 | Louis E. Sternberg | Portable attachable weighing system |
EP1700088B1 (en) * | 2003-12-12 | 2012-06-06 | Hill-Rom Services, Inc. | Seat force sensor |
US7176391B2 (en) * | 2004-09-13 | 2007-02-13 | Hill-Rom Services, Inc. | Load cell to frame interface for hospital bed |
WO2007080565A1 (en) * | 2006-01-13 | 2007-07-19 | Baby Patent Ltd. | Baby bath development and weighing system |
US7381910B1 (en) | 2007-04-13 | 2008-06-03 | Anodyne Medical Devices, Llc | Sensor frame for generating a weight signal of a curved object |
DE102007050485A1 (en) | 2007-08-30 | 2009-03-05 | Soehnle Professional Gmbh & Co. Kg | Liege device |
CZ18426U1 (en) * | 2008-02-15 | 2008-04-07 | Linet, Spol. S R.O. | Bed positioning mechanism |
JP5965716B2 (en) * | 2012-04-27 | 2016-08-10 | 昭和電工株式会社 | Bed with load detection function and load detector |
JP5965717B2 (en) * | 2012-05-07 | 2016-08-10 | 昭和電工株式会社 | Bed with load detection function and load detector |
US10292605B2 (en) | 2012-11-15 | 2019-05-21 | Hill-Rom Services, Inc. | Bed load cell based physiological sensing systems and methods |
DE102013000589A1 (en) | 2013-01-16 | 2014-07-17 | Ralf Hirschfeld | Weight measurement and monitoring device for medical chairs and couch system for inpatient care, transmits measurement data through short messaging service or Bluetooth, such that measurement results can be visualized |
JP6265556B2 (en) * | 2013-04-26 | 2018-01-24 | 昭和電工株式会社 | Bed with load detection function and load detector for bed |
TWI503074B (en) * | 2013-08-16 | 2015-10-11 | Univ Nat Taiwan | Plant growth weight measurement instrument and method thereof |
CA3120313C (en) | 2014-08-27 | 2022-01-11 | Umano Medical Inc. | Hospital bed with patient weight and displacement sensors |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4296951A (en) * | 1979-06-29 | 1981-10-27 | Ladish Co. | Spheroidal interconnector for filtration modules |
US4411327A (en) * | 1981-05-14 | 1983-10-25 | Hottinger Baldwin Measurements, Inc. | Apparatus for applying a load to a strain gage transducer beam |
US4600066A (en) * | 1983-05-19 | 1986-07-15 | Reliance Electric Company | Load cell apparatus |
US4776050A (en) * | 1984-01-17 | 1988-10-11 | Support Systems International, Inc. | Fluidized patient support system |
US4672699A (en) * | 1984-01-17 | 1987-06-16 | Support Systems International, Inc. | Fluidized patient support system with side rail assembly |
US4526246A (en) * | 1984-02-23 | 1985-07-02 | Reliance Electric Company | Water-resistant weighing apparatus |
US4793428A (en) * | 1988-02-29 | 1988-12-27 | Cobe Asdt, Inc. | Hospital bed with an integrated scale |
US4974692A (en) * | 1989-06-26 | 1990-12-04 | Ssi Medical Services, Inc. | Weigh bed |
US4926951A (en) * | 1989-06-26 | 1990-05-22 | Ssi Medical Services, Inc. | Weigh bed |
-
1991
- 1991-10-04 US US07/770,908 patent/US5173977A/en not_active Expired - Lifetime
-
1992
- 1992-09-30 AU AU27875/92A patent/AU2787592A/en not_active Abandoned
- 1992-09-30 CA CA002119456A patent/CA2119456C/en not_active Expired - Fee Related
- 1992-09-30 AT AT92921656T patent/ATE160283T1/en not_active IP Right Cessation
- 1992-09-30 WO PCT/US1992/008329 patent/WO1993006807A1/en active IP Right Grant
- 1992-09-30 EP EP92921656A patent/EP0606381B1/en not_active Expired - Lifetime
- 1992-09-30 DE DE69223255T patent/DE69223255T2/en not_active Expired - Fee Related
Non-Patent Citations (2)
Title |
---|
No further relevant documents disclosed * |
See also references of WO9306807A1 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8717181B2 (en) | 2010-07-29 | 2014-05-06 | Hill-Rom Services, Inc. | Bed exit alert silence with automatic re-enable |
Also Published As
Publication number | Publication date |
---|---|
EP0606381B1 (en) | 1997-11-19 |
WO1993006807A1 (en) | 1993-04-15 |
DE69223255D1 (en) | 1998-01-02 |
AU2787592A (en) | 1993-05-03 |
ATE160283T1 (en) | 1997-12-15 |
CA2119456C (en) | 2003-12-16 |
CA2119456A1 (en) | 1993-04-15 |
DE69223255T2 (en) | 1998-05-28 |
EP0606381A4 (en) | 1994-08-24 |
US5173977A (en) | 1992-12-29 |
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